Examine source code of Password-Generator

{
  "manifest_version": 2,
  "name": "Password-generator",
  "version": "1.0",
  "description": "A simple Firefox add-on for generating password",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "1200": "./pass-G.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ea8816b6-cbd4-476a-91f9-9b7eb44236c4}"
    }
  }
}